allopurinol and its Impurities

Allopurinol is a purine analog and it is a structural isomer of hypoxanthine. It is an inhibitor of the enzyme xanthine oxidase. Allopurinol is used to treat excess uric acid in the blood and gout. It is sold under the brand name Zyloprim. Reference standards of Allopurinol API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.

Displaying 46 results for allopurinol Impurities
PA 01 39000

Allopurinol

Allopurinol

  • Catalogue No.:PA 01 39000

  • CAS :

    315-30-0

  • Molecular Formula : C5H4N4O

  • Molecular Weight :  136.11

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PA 01 39010

Allopurinol - Impurity A

3-Amino-4-carbamoylpyrazole Hemisulfate

  • Catalogue No.:PA 01 39010

  • CAS :

    27511-79-1

  • Molecular Formula : C4H6N4O•0.5H2SO4

  • Molecular Weight : 175.16

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PA 01 39020

Allopurinol - Impurity B

3-(Formylamino)-1H-pyrazole-4-carboxamide

  • Catalogue No.:PA 01 39020

  • CAS :

    22407-20-1

  • Molecular Formula : C5H6N4O2

  • Molecular Weight : 154.13

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PA 01 39030

Allopurinol - Impurity C

3-(4H-1,2,4-Triazol-4-yl)-1H-pyrazole-4-carboxamide

  • Catalogue No.:PA 01 39030

  • CAS :

    1346604-13-4

  • Molecular Formula : C6H6N6O

  • Molecular Weight : 178.15

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PA 01 39040

Allopurinol - Impurity D

Ethyl 3-Amino-4-pyrazolecarboxylate

  • Catalogue No.:PA 01 39040

  • CAS :

    6994-25-8

  • Molecular Formula : C6H9N3O2

  • Molecular Weight : 155.15

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PA 01 39050

Allopurinol - Impurity E

3-(Formylamino)-1H-pyrazole-4-carboxylic Acid Ethyl Ester

  • Catalogue No.:PA 01 39050

  • CAS :

    31055-19-3

  • Molecular Formula : C7H9N3O3

  • Molecular Weight : 183.16

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PA 01 39060

Allopurinol - Impurity F (35% in Water)

Hydrazine

  • Catalogue No.:PA 01 39060

  • CAS :

    302-01-2

  • Molecular Formula : H4N2

  • Molecular Weight : 32.05

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PA 01 39061

Allopurinol - Impurity F (Hydrochloride Salt)

Hydrazine Monohydrochloride

  • Catalogue No.:PA 01 39061

  • CAS :

    2644-70-4

  • Molecular Formula : ClH5N2

  • Molecular Weight : 68.51

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PA 01 39510

3-Amino-4-cyanopyrazole

3-Amino-4-cyanopyrazole

  • Catalogue No.:PA 01 39510

  • CAS :

    16617-46-2

  • Molecular Formula : C4H4N4

  • Molecular Weight : 108.1

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PA 27 01358

Allopurinol - Impurity F (Monohydrate Salt)

Hydrazine Hydrate

  • Catalogue No.:PA 27 01358

  • CAS :

    7803-57-8

  • Molecular Formula : H6N2O

  • Molecular Weight : 50.06

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PA STI 004680

Allopurinol-d2

Allopurinol-d2

  • Catalogue No.:PA STI 004680

  • CAS :

    916979-34-5

  • Molecular Formula : C5H2D2N4O

  • Molecular Weight : 138.12

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PA STI 033020

4,6-Dihydroxypyrazolo[3,4-d]pyrimidine-13C,15N2

4,6-Dihydroxypyrazolo[3,4-d]pyrimidine-13C,15N2

  • Catalogue No.:PA STI 033020

  • CAS :

    1217036-71-9

  • Molecular Formula : C413CH4N215N2O2

  • Molecular Weight : 155.09

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PA USP1013013

Allopurinol Related Compound B (5-(formylamino)-1H-pyrazole-4-carboxamide) (1013013)

Allopurinol Related Compound B (5-(formylamino)-1H-pyrazole-4-carboxamide) (1013013)

  • Catalogue No.:PA USP1013013

  • CAS :

    22407-20-1

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA USP1013024

Allopurinol Related Compound A (3-Amino-4-carboxamidopyrazole Hemisulfate) (1013024)

Allopurinol Related Compound A (3-Amino-4-carboxamidopyrazole Hemisulfate) (1013024)

  • Catalogue No.:PA USP1013024

  • CAS :

    27511-79-1

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA USP1013068

Allopurinol Related Compound E (ethyl 5-(formylamino)-1H-pyrazole-4-carboxylate) (1013068)

Allopurinol Related Compound E (ethyl 5-(formylamino)-1H-pyrazole-4-carboxylate) (1013068)

  • Catalogue No.:PA USP1013068

  • CAS :

    31055-19-3

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA USP1013002

Allopurinol (1013002)

Allopurinol (1013002)

  • Catalogue No.:PA USP1013002

  • CAS :

    315-30-0

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA USP1013079

Allopurinol Related Compound F (ethyl-(E/Z)-3-(2-carbethoxy-2-cyanoethenyl)amino-1H-pyrazole-4-carb (1013079)

Allopurinol Related Compound F (ethyl-(E/Z)-3-(2-carbethoxy-2-cyanoethenyl)amino-1H-pyrazole-4-carb (1013079)

  • Catalogue No.:PA USP1013079

  • CAS :

    321571-07-7

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA USP1013046

Allopurinol Related Compound D (ethyl 5-amino-1H-pyrazole-4-carboxylate) (1013046)

Allopurinol Related Compound D (ethyl 5-amino-1H-pyrazole-4-carboxylate) (1013046)

  • Catalogue No.:PA USP1013046

  • CAS :

    6994-25-8

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA BP870RB

allopurinol (870RB)

allopurinol (870RB)

  • Catalogue No.:PA BP870RB

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA BP831RB

allopurinol impurity A (831RB)

allopurinol impurity A (831RB)

  • Catalogue No.:PA BP831RB

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA BP832RB

allopurinol impurity B (832RB)

allopurinol impurity B (832RB)

  • Catalogue No.:PA BP832RB

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA BP843RB

allopurinol impurity C (843RB)

allopurinol impurity C (843RB)

  • Catalogue No.:PA BP843RB

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA BP845RB

allopurinol impurity E (845RB)

allopurinol impurity E (845RB)

  • Catalogue No.:PA BP845RB

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA ICRS0204

Allopurinol (ICRS0204)

  • Catalogue No.:PA ICRS0204

  • CAS :

    NA

  • Molecular Formula :

  • Molecular Weight : NA

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PA USP1013035

Allopurinol Related Compound C (5-(4H-1,2,4-triazol-4-yl)-1H-pyrazole-4-carboxamide) (1013035)

Allopurinol Related Compound C (5-(4H-1,2,4-triazol-4-yl)-1H-pyrazole-4-carboxamide) (1013035)

  • Catalogue No.:PA USP1013035

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA BP844RB

allopurinol impurity D (844RB)

allopurinol impurity D (844RB)

  • Catalogue No.:PA BP844RB

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA EPA0350000

Allopurinol (A0350000)

Allopurinol (A0350000)

  • Catalogue No.:PA EPA0350000

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA EPA0350010

Allopurinol impurity A (A0350010)

Allopurinol impurity A (A0350010)

  • Catalogue No.:PA EPA0350010

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA EPA0350020

Allopurinol impurity B (A0350020)

Allopurinol impurity B (A0350020)

  • Catalogue No.:PA EPA0350020

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA EPA0350030

Allopurinol impurity C (A0350030)

Allopurinol impurity C (A0350030)

  • Catalogue No.:PA EPA0350030

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA EPA0350040

Allopurinol impurity D (A0350040)

Allopurinol impurity D (A0350040)

  • Catalogue No.:PA EPA0350040

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA EPA0350050

Allopurinol impurity E (A0350050)

Allopurinol impurity E (A0350050)

  • Catalogue No.:PA EPA0350050

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA 01 39530

Allopurinol riboside

Allopurinol riboside

  • Catalogue No.:PA 01 39530

  • CAS :

    16220-07-8

  • Molecular Formula : C10H12N4O5

  • Molecular Weight : 268.23

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PA IPIPRS 46 14

Allopurinol (IPRS/46/14)-from IPC

  • Catalogue No.:PA IPIPRS 46 14

  • CAS :

    NA

  • Molecular Formula :

  • Molecular Weight : NA

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PA 27 12262

Allopurinol - Impurity F (Dihydrochloride Salt)

Hydrazine Dihydrochloride

  • Catalogue No.:PA 27 12262

  • CAS :

    5341-61-7

  • Molecular Formula : Cl2H6N2

  • Molecular Weight : 104.96

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PA 01 39011

Allopurinol - Impurity A (Freebase)

5-Amino-1H-pyrazole-4-carboxamide

  • Catalogue No.:PA 01 39011

  • CAS :

    5334-31-6

  • Molecular Formula : C4H6N4O

  • Molecular Weight : 126.12

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PA 01 0391000

Oxypurinol

Oxypurinol

  • Catalogue No.:PA 01 0391000

  • CAS :

    2465-59-0

  • Molecular Formula : C5H4N4O2

  • Molecular Weight : 152.11

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PA 01 0390061

Allopurinol - Impurity F (Hydrate)

Hydrazine Monohydrate

  • Catalogue No.:PA 01 0390061

  • CAS :

    10217-52-4

  • Molecular Formula : N2H4.xH20

  • Molecular Weight : NA

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PA 01 0391001

(E/Z)-3-[(2-Cyano-3-ethoxy-3-oxo-1-propenyl)amino]-1H-Pyrazole-4-carboxylic Acid Ethyl Ester

(E/Z)-3-[(2-Cyano-3-ethoxy-3-oxo-1-propenyl)amino]-1H-Pyrazole-4-carboxylic Acid Ethyl Ester

  • Catalogue No.:PA 01 0391001

  • CAS :

    321571-07-7

  • Molecular Formula : C12H14N4O4

  • Molecular Weight : 278.26

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PA IMP 03 17

Allopurinol Impurity A (IMP/03/17)

Allopurinol Impurity A (IMP/03/17)

  • Catalogue No.:PA IMP 03 17

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA 01 0391002

N-Nitroso Allopurinol

N-Nitroso Allopurinol

  • Catalogue No.:PA 01 0391002

  • CAS :

    NA

  • Molecular Formula : C5H3N5O2

  • Molecular Weight : 165.11

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PA 01 0391003

9-Nitroso-9H-purin-6-ol

9-Nitroso-9H-purin-6-ol

  • Catalogue No.:PA 01 0391003

  • CAS :

    NA

  • Molecular Formula : C5H3N5O2

  • Molecular Weight : 165.11

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PA IPRSA033

Allopurinol (IPRSA033)

Allopurinol (IPRSA033)

  • Catalogue No.:PA IPRSA033

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA IMPF019

Allopurinol Impurity B (IMPF019)

Allopurinol Impurity B (IMPF019)

  • Catalogue No.:PA IMPF019

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA IMPA014

Allopurinol Impurity C (IMPA014)

Allopurinol Impurity C (IMPA014)

  • Catalogue No.:PA IMPA014

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA 01 0391004

3-Amino-1H-pyrazole-4-carbohydrazide

3-Amino-1H-pyrazole-4-carbohydrazide

  • Catalogue No.:PA 01 0391004

  • CAS :

    41621-10-7

  • Molecular Formula : C4H7N5O

  • Molecular Weight : 141.13

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CPHI INDIA- 28, 30 November